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Highly Efficient Oxygen Evolution Activity of Ca 2 IrO 4 in an Acidic Environment due to Its Crystal Configuration.
- Source :
-
ACS omega [ACS Omega] 2018 Mar 09; Vol. 3 (3), pp. 2902-2908. Date of Electronic Publication: 2018 Mar 09 (Print Publication: 2018). - Publication Year :
- 2018
-
Abstract
- We systematically characterized the perovskite-like oxides Ca <subscript>2</subscript> IrO <subscript>4</subscript> and CaIrO <subscript>3</subscript> as the oxygen evolution reaction (OER) catalysts. Compared with IrO <subscript>2</subscript> , universally accepted as the current state-of-the-art OER catalyst, Ca <subscript>2</subscript> IrO <subscript>4</subscript> showed an excellent OER catalytic activity in an acidic environment, whereas CaIrO <subscript>3</subscript> did not. X-ray photoelectron spectroscopy (XPS) spectra showed that the oxidation of iridium in Ca <subscript>2</subscript> IrO <subscript>4</subscript> and CaIrO <subscript>3</subscript> was slightly beyond +4. X-ray absorption near-edge structure (XANES) spectra illustrated that the IrO <subscript>6</subscript> octahedral geometric structure in Ca <subscript>2</subscript> IrO <subscript>4</subscript> and CaIrO <subscript>3</subscript> showed differences. The IrO <subscript>6</subscript> octahedral is asymmetrically distorted and uniformly compressed in Ca <subscript>2</subscript> IrO <subscript>4</subscript> and CaIrO <subscript>3</subscript> . Therefore, we propose that the IrO <subscript>6</subscript> octahedral distortion plays an important role in the OER activities.<br />Competing Interests: The authors declare no competing financial interest.
Details
- Language :
- English
- ISSN :
- 2470-1343
- Volume :
- 3
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- ACS omega
- Publication Type :
- Academic Journal
- Accession number :
- 31458561
- Full Text :
- https://doi.org/10.1021/acsomega.8b00015